Question

How can you quickly calculate 20 percent of any bill amount? a-Round the amount to the nearest $10, remove the zero in the ones place, and add half the resulting amount.
b-Round the amount to the nearest $10, remove the zero in the ones place, and halve the resulting amount. c-Round the amount to the nearest $10, remove the zero in the ones place, and double the resulting amount.

Answer 1

so with what he said it would be A, Right?                                        

Answer 2

From 10 dollars is 2 dollars it's super easy to only take 20 percent it would take like 2 seconds. hope I helped.